单项选择题

A．effectiver
B．effective
C．more effective
D．most effective
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单项选择题
A．belowB．afterC．beforeD．behind
A．below
B．after
C．before
D．behind
单项选择题
A．foundB．inventedC．createdD．discovered
A．found
B．invented
C．created
D．discovered
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